Chapter 7 and 8 Test Review
When the formula equation CuSO4(aq) + Fe(s) -> Fe2(SO4)3(aq) + 3CU(s) is correctly balanced, the coefficient of CuSo4(aq) is _________.
3
What symbol indicates a reversible reaction a. ← → b. ↑ c. → d. ←
a. <-- -->
How many moles of compound are there in 15.0 g of potassium dichromate, K2Cr2O7? (The molar mass of K2Cr2O7 is 294.2 g.) a. 0.0510 mol b. 11.0 mol c. 15.0 mol d. 294 mol
a. 0.0510 mol
Which reaction does not occur? a. 2hF(aq) + Cl2(g) ->F2(g) + 2HCl(aq) b. 2Na(s) + ZnF2(aq) -> 2NaF(aq) + Zn(s) c. Fe(s) + CuCl2(aq) -> FeCl2(aq) + Cu(s) d. 2HCl9aq) + Mg(s) -> MgCl2(aq) +H2(g)
a. 2hF(aq) + Cl2(g) ->F2(g) + 2HCl(aq)
If calcium is listed above magnesiu in the activity series, and magnesium is listed abve zinc, which of the following reaction s is possible? a. Ca(s) + MgC2(aq) -> b. Zn(s) + mgCl2(aq) -> c. Zn(s) + CaCl2(aq) -> d. Mg(s) + CaCl2(aq) ->
a. Ca(s) + MgCl2(aq) ->
Predict what happens when zinc is added to water a. No reaction occurs b. Steam is produced. c. Zinc oxide forms. d. Hydrogen is released.
a. No reaction occurs.
Predict what heppens when nickel is added to a solution of potassium chloride. a. No reaction occurs. b. Nickel chloride forms. c. Potassium nickel chloride forms. d. Hydrochloric acid forms.
a. No reaction occurs.
What is the chemical formula for the compound made of tin(IV) ions and chloride, Cl^-, ions? a. SnCl4 b. Sn2Cl2 c. SnCl2 d. Sn4Cl
a. SnCl4
Which of the following indicates that a chemical equation is balanced? a. The numbers of atoms of each element are the same of both sides of the equation. b. All of the coefficients are the same. c. The numbers of molecules on each side of the equation are equal. d. The sums of the coefficients on each side of the equation are equal.
a. The number of atoms of each element are the same on both sides of the equation.
The term acid usually refers to a. a solution of the acid compound in water. b. only the acid compound. c. a compound containing hydrogen d. a compound containing hydrogen and oxygen.
a. a solution of the acid compound in water.
The chemical formula for an ionic compund represents one a. formula unit. b. ion. c. molecule. d. cation
a. formula unit.
What is the correct name for the No3/^- ion? a. nitrate b. nitrite c. nitride d nitrogen oxide
a. nitrate
Atoms have an oxidation number of zero in a(n) a. pure element. b. acid. c. ionic compound. d. molecular compound.
a. pure element
An active metal and a halogen react to form a(n) a. salt. b hydroxide. c. acid. d. oxide.
a. salt
In which tyoe if reaction do two or more compounds reaction to form one product? a synthesis db. decomposition c. combustion d. single-displacement
a. synthesis
What type of chemical reaction is represented by the following word equaiton? iron + oxygen -> iron (II) oxide a. synthesis b. replacement c. combustion d. double-displaement
a. synthesis
What can be predicted y using an activity series? a. whether a certain chemical reaction will occur b. the amount of energy released by a chemical reaction c. the electronegativity values of elements d. the melting points of elements
a. whether a certain chemical reaction will occur
If a certain metal is placed in an ionic solution containing another metal and no reaction occurs, then the metal originally in the solution is a. a halogen. b. higher on the activity series. c. not on the activity series. d. unreactive.
b higher on the activity series.
What is the total number of molecules that is represented by the following chemical equation? NH4NO2 -> N2 + 2H2O a. 3 b. 4 c. 8 d. 16
b. 4
An ion of bromine with a single negative charge has the symbol and the name a. Br^+, bromide ion. b. Br^-, bromide ion. c. Br^+, bromium ion. d. Br^-, bromium ion,
b. Br^-, bromide
What is the molecular formula for the compound with a formula mass of 58. 12 amu and an empirical formula of C2H5? a. C2h5 b. C4H10 c. C6H15 d. C8H20
b. C4H10
What is the correct notation for a calcium ion whose outershell is a full octet? a. Ca^1+ b. Ca^2+ c. Ca^1- d. Ca^2-
b. Ca^2+
Predict what happens when calcium metal is added to a solution of magnesium chloride. a. Noreaction occurs. b. Calcium cloride forms. c. Magnesium calcite forms. d Gaseous calcium is produced.
b. Calcium chloride forms.
Which of the following is true regarding the law of conservation of mass? a. It dictates that the number of molecules on each side of a chemical equation must be the same. b. It dictates that the umber of atoms of each element must be the same on both sides of a chemical equation. c. It states that the mass of the eactants must remain constant in order ofr a chemical reaction to proceed. d. It does not apply to chemical reaction.
b. It dictates that the umber of atoms of each element must be the same on both sides of a chemical equation.
Which equation violates the law of conservation of mass? a. 2H2 + O2 -> 2H2O b. KCl + Br2 -> KBr + Cl2 c. 2Fe2O3 + 3C -> 4Fe + 3CO2 d. Na2Co3 + 2HCl -> 2NaCl + H2O + CO2
b. KCl + Br2 -> KBr + Cl
What is the correct formula for the compound made of magnesium and nitrogen? a. Mg2N3 b. Mg3N2 c. MgN2 d. MgN
b. Mg3N2
What is the formula for the compound dinitrogen tetroxide a. N2O3 b. N204 c. N3O2 d. N3O4
b. N2O4
What is the correct formula for the compound platinum(VI) fluoride? a. PtF3 b. PtF6 c. Pt6F2 d. Pt6F
b. PtF6
Which of the following molecular formula does not have the corresponding empirical formula XY2Z? a. X2Y4Z2 b. XYZ c. X6Y12Z6 d. X3Y6Z3
b. XYZ
In the expression 3CO2, the numbers 3 and 2 are, respectively, a. a subscript and a coefficient. b. a coefficient and a subscript. c. two subscripts. d. two coefficients.
b. a coefficient and a subscript.
The ability of an element to react is the element's a. valance. b. activity. c. stability. d. electronegativity.
b. activity.
The formula mass of any compound is described in units of a. grams. b. amu. c. moles. d. grams per mole.
b. amu
An element in the activity series can replace any element a. in the periodic table. b. below it on the list. c. above it on the list. d. in its group.
b. below it on the list
The simplest whole-number ratio of moels of each element in a compound is known as the a. percent composition. b. empirical formula. c. Stock formula. d. molecular formula.
b. empirical formula
The activity series helps you predict a. the amount of prouct formed by a chemical reaciton. b. whether or not a specific chemical reaciton is possible. c. the coefficients needed to balance a chemical equation. d. the amount of energy needed to state a chemical reaction.
b. whether or not a specific chemical reaciton is possible.
Metal X replaces the ions of metal Y from solution, but it cannot replace the ions of metal Z from solution, The order these metals should have in the activity series (from top to bottom) is a. x, y, z b. z, x, y c. y, x, z d. z, y, x
b. z, x, y
What is the oxidation number of nickel in NiCO3 a. 0 b. +1 c. +2 d. +3
c. +2
What is the oxidation number of phosphorus in the PO4/^3- ion? a. -3 b. 0 c. +5 d. +8
c. +5
What is the molar mas sof pure tin? a. 1.00 g/mol b. 47.88 g/mol c. 118.71 g/mol d. 237.42 g/mol
c. 118. 71 g/mol
How many atoms are present in one formula unit of barium acetate, Ba(C2H3O2)2? a. 4 b. 8 c. 15 d. 16
c. 15
What is the total number of molecules represented by the following equaiton? 2C4H10(g) + 13O2(g) ->8CO2(g) + 10H2O(g) a. 4 b. 15 c. 18 d. 33
c. 18
Which coefficients correctly balance the formula equaiton below? KClO3(s) -> KCl(s) +O2(g) a. 1, 1, 1 b. 1, 1, 3 c. 2, 2, 3 d. 2, 1, 1
c. 2, 2, 3
Which reaction can be predicted from the activity series? a. 2Cl(g) -> Cl2(g) HCl(aq) +NaOH(aq) -> NaCl(aq) + H2O(l) c. 2H2O(aq) + 2Na(s) -> 2NaOH(aq) + H2(g) d. Cl2(g) -> 2Cl(g)
c. 2H2O(aq) + 2Na(s) -> 2NaOH(aq) + H2(g)
Which of the following equations represent the balanced equation for the reaction of iron and oxygen? a. 2Fe + O2 -> Fe2O3 b. Fe3O2 -> Fe2O3 c. 4Fe + 3O2 -> 2Fe2O3 d. 3Fe + 3O2 -> 2Fe2O3
c. 4Fe + 3O2 -> 2Fe2O3
What is the mass percentage of cobal in cobalt(II) floride, CoF2? a. 33.33% b. 39.20% c. 60.80% d. 96.93%
c. 60.80%
What is the correct formula for copper(I) cyanide? a. CuCy b. CuCy2 c. CuCN d. Cu2CN
c. CuCn
Which of the following is not true regarding a properly written chemical equation? a. It must be balanced. b. It must contain proper chemical formulas. c. It must show the formation of a precipiate or a gas. d. It should represent known data.
c. It must show the formation of a precipitate or a gas.
What is the empirical formula for a compound that contains 12.62% Li, 29.17% S, and 58.21% O a LiSO2 b. LiS2O6 c. Li2SO4 d. Li2SO3
c. Li2SO4
You mix solution A with solution B in a beaker. Which of the following observation does not help you probe that a chemical reaciton has occurred? a. The beaker becomes warm. b. You see gas bubble out of the solution. c. Solution a, solution B, and the mixture are all yellow. d. None of the above; all help prove that a chemical reaciton has occurred.
c. Solution A, solution B, and the mixture are all yellow.
In a chemical equation, the formula of a substance in water solution is followed by the symbol a. (l). b. (s). c. (g). d. (aq).
d. (aq).
The formation of a solid product in a chemical reaction is represented by the symbol a. (aq). b. (g). c. (l). d. (s).
d. (s).
Which set of coefficients will balance the equation below? NaOH + Cu(NO3)2 -> Cu(OH)2 + NaNO3 a. 1, 1, 1, 1 b. 1, 2, 2, 1 c. 2, 1, 2, 1 d. 2, 1, 1, 2,
d. 2, 1, 1, 2
Which equaiton is not balanced? a. 2H2 +O2 -> 2H2O b. 4H2 + 2O2 -> 4H2O c. H2+ H2+ O2 -> H2O + H2O4H2 + 2O2 -> 4H2O d. 2H2 + O2 -> H2O
d. 2H2 + O2 -> H2O
What is the mass of 4.80 mol barium hydride, BaH2? a. 4.80 g b. 29.0 g c. 139 g d. 669 g
d. 669 g
What is the formula for the compound made of aluminum ions, Al^3+, and sulfate ions, SO4/^2-? a, AlSo4 b. Als3SO4 c. Al(SO4)3 d. Al2(SO4)3
d. Al2(SO4)
From a complete and correctly written chemical equation, you can obtain the a. chemical formulas of the reactants nd products. b. relative amounts of the reactants and products. c. physical states of the reactants and products. d. All of the above.
d. All of the above a. chemical formulas of the reactants nd products. b. relative amounts of the reactants and products. c. physical states of the reactants and products.
Which of the following may indicate that a chemical reaciton has occurred? a. release of energy as light b. a color change c. gas bubble formation d. All of the above
d. All of the above a. release of energy as light b. a color change c. gas bubble formation
Which of th efollowing is true regarding double-displacement reactions? a. Two products are formed. b. The ions of the two reactants must be exchanged. c. A precipitate may form. d. All of the above
d. All of the above. a. Two products are formed. b. The ions of the two reactants must be exchanged. c. A precipitate may form.
Which of the following is a product in the reaction described by the word equation below? iron + copper(II) sulfate -> iron(II) sulfate + copper a. iron(II) sulfate b. copper c. iron d. Both (a) and (b)
d. Both (a) and (b) a. iron(II) sulfate b. copper
In the reaciton described by the word equation sodium + water -> sodium hydroxide + hydrogen gas a. sodium hydroxide is a product b. sodium is product c. water is a reactant d. Both (a) and (c)
d. Both (a) and (c) a. sodium hydroxide is a product c. water is a reactant
What is the formula for carbonic acid? a. CH3COOH b. HClO3 c. CH4 d. H2Co3
d. H2Co3
Predict what heppens when lead is added to nitric acid. a. No reaciton occurs. b. Oxygen is released. c. Lead oxide forms. d. Hydrogen is released.
d. Hydrogen is released
What is the molecular formula for the compound that is made up of 30.45% g N and 69.55 g O, and has a formula of mass of 92 amu? a. NO b. N2O2 c. NO2 d. N2O4
d. N2O4
Which of the following is true regarding single-displacement reacitons? a Only one product is formed b. There is only one reagent. c. It requires oxygen. d. One element replaces another in a compound
d. One element replaces another in a compound
To balance a chemical equation, you must a. adjust the subscripts. b. adjust the umber of proucts. c. adjust the number of reactants d. adjust the coefficients
d. adjust the coefficients
They activity series of metals indicates the ease with which metal a. atoms gain neutrons. b. nuclei fuse. c. atoms form covalent bonds. d. atoms lose electrons
d. atoms lose electrons
A mixture of propane and oxygen react to form carbon disoxide and water. What type of chemical reaciton is this? a. synthesis b. decomposition c. double- displacement d. combustion
d. combustion
Calcium carbonste, CaCO3, reacts to form calciumoxide, CaO, and carbon dioxide, CO2. What type of reaciton is this? a. synthesis b. repleacement c. comustion d. decomposition
d. decomposition
What type of chemical reaciton does the following chemical equation represent? 2HCl(aq) + Cr(s) -> H2(g) + CrCl2(aq) a. composition b. single displcement c. decomposition d. double- displacement
d. decomposition
What is the correct name for the compound P2Cl4? a. phosphorus chloride b. phosphorus tetrachloride c. diphosphorus chloride d. diphosphorus tetrachloride
d. diphosphorus tetra chloride
Oxidation numers are used to indicate the a. charge of an ion. b. numbber of atoms or ions in a compound. c. typeof bond holding particles together in a compound. d. distribution of electrons among the bonded particles in a compound.
d. distribution of electrons among the bonded particles in a compound.
Oxides of active metals, such as CaO, react with water to produce a. metal carbonates. b. metal hydrides. c. acids. d. metal hydroxides.
d. metal hydroxides.
What is the correct name for the compound Ni2O3 using the stock system? a. nickel(II) oxide b. dinickel trioxide c. nickel trioxide d. nickel(III) oxide
d. nickel(III) oxide
What follows an element's symbol in a chemical formula to indicate the number of atoms of that element in one molecule of the compound? a. charge sign b. superscripted number c. number in arenthees d. subscripted number
d. subscripted number
The molar mass of water is equal to a. 1 g of O plus 2 g of H. b. 1 g of O plus 1 g of H. c. the mass of 1 mol of O plus the mass of 1 mol of H. d. the mass of 1 mole of O plus the mass of 2 mol of H.
d. the mass of 1 mol of O plus the mass of 2 mole of H.
In Greek letter delta (△) above the arrow in a chemical equation means a. "yields" or "produces." b. a catalyst is used in the reaction. c. the reaction releases enegy as heat. d. the reactants are heated.
d. the reactants are heated.
The reaction represented by the equation 2HgO(s) -> 2Hg(l) + O2(g) is classified as a(n) ___________ reaciton.
decomposition
In a chemical equation, the symbol ? over the reaction arrow signifies that the reactans are __________.
heated
When placed in water, a metal more active than hydrogen will form two substances, a metal hydroxide and ________ gas.
hydrogen
The name fo rthe CrO4/^2- ion is ______.
Chromate anion
Magnesium bromide(aq) +chlorine(g) yields a. Mg(s) and BrCl(aq). b. MgCl(aq) and Br2(l). c. MgBrCl(aq). d. MgCl2(aq) and Br2(l).
D. MgCl2(aq) and Br2(l).
The stock name for the compound P2O5 is _____________.
Diphosphorus Pentoxide
In writing a formula equation for a reaction that roduces hydrogen gas, the correct representation of hydrogen gas is ______.
H2
The oxidation numbers for each atom in H2CO3 are ____________.
H= 2+ C= 4+ O= 6-
The oxidation numbers for each atom in NH4/^+ are __________.
N = 3- H= 4+
You have an unknown metal, X. You conduct two experiments. The results are shown in the table below. Procedure = X(s) + NaCl(aq); Result = No reaction Procedure = X(s+)ZnCl2(aq); Result = Reaction of metal Which of the following statements is a logical conclusion based on the experimental data? a. The unknwn metal is higher on the activity series than both sodium and zinc. b. The unknown metal is higheron the activity series than soium, but below zinb. c. The unknown metal is higher on the activity series than zinc, but below sodium. d. The unknown metal is below both sodium and zinc on the activity series.
c. The unknown metla is higher on the activity series than zinc, but below sodium.
What will be the result of the reaction described by the followin chemical equation? PCl5(g) ↔(sharing symbol) PCl3(g) + CL2(g) a. a mixture of PCl5(g) and PCl3(g) only b. a mixture of PCl3(g) and Cl2(g) only c. a misture of PCl5(g) and Cl3(g) and Cl2(g) d. PCl5(g) only
c. a mixture of PCl5(g), Cl3(g) and Cl2(g)
What is the correct name for the acid CH3COOH? a. carbonic acid b. carbonate acid c. acetic acid d. acetous acid
c. acetic acid
What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reacitons? a. reactivity list b. reactions equence c. activity series d. periodic list
c. activity series
In a single-displacement reaciton, an element in the activity series most likely can replace any element a. above it on the list. b. in the same group. c below it on the list. d. in anyother group.
c. below it on the list
The platinum(II) ion and hte platinum(IV) ion a. are anions. b. are polyatomic ions. c. have charges of 2+ and 4+, respectively, d. have charges of 1+ and3+, respectively.
c. have charges of 2+ and 4+, respectively.
If metal X is lower than metal Y in the activity series, then metal X a. replaces ions of metal Y in a solution. b. loses electrons more readily than does metal Y. c. loses electrons less readily than does metal Y. d forms positive ions more readily than does metal Y.
c. loses electrons less readily than does metal Y
The salt calcium nitrate, Ca(NO3)2, contains the anion from a. calcium. b.nitrogen. c. nitric acid. d. nitrous acid.
c. nitric acid.
What does CH4 represent in the balanced chemical equation shown below? C + 2H2 -> CH4 a. one atom of CH4 b. five atoms of CH4 c. one molecule of CH4 d. 1 g of CH4
c. one molecule of CH4
What is the name of the compound made of zinc ions, Zn^2+, and fluoride ions, F^-? a. zinc difluoride b. zinc fluorate c. zinc fluoride d. zinc(II) fluorite
c. zinc fluoride
The reaction represented by the equation Mg(s) + 2HCl(aq) -> H2(g) + MgCl2(aq) is classified as a(n) ___________ reaction.
single-replacement
In the chemical reaciton represented by the equaiton 2Cr(s) + 3O2(g) -> 2CrO3(S), two chronium atoms combine with _____________ oxygen atoms.
six
In the chemical equation 2AlCl3(aq) + 3Pb(NO3)2(aq) -> 3PbCl2(s) + 2Al(NO3)3(aq), the state of PbCl2 is a(n) __________.
solid
The name and formula for the compound formed by strontium ions and sulfite ions are ______________.
strontium sulfite; SrSO3
